exit(3tcl)

NAME

   exit - End the application

SYNOPSIS

   exit ?returnCode?
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DESCRIPTION

   Terminate  the  process, returning returnCode to the system as the exit
   status.  If returnCode is not specified then it defaults to 0.

EXAMPLE

   Since non-zero exit codes are usually interpreted as error cases by the
   calling  process,  the  exit  command is an important part of signaling
   that something fatal has gone wrong. This code fragment  is  useful  in
   scripts to act as a general problem trap:
          proc main {} {
              # ... put the real main code in here ...
          }

          if {[catch {main} msg options]} {
              puts stderr "unexpected script error: $msg"
              if {[info exist env(DEBUG)]} {
                  puts stderr "---- BEGIN TRACE ----"
                  puts stderr [dict get $options -errorinfo]
                  puts stderr "---- END TRACE ----"
              }

              # Reserve code 1 for "expected" error exits...
              exit 2
          }

SEE ALSO

   exec(3tcl)

KEYWORDS

   exit, process

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